On Sep 26, 2007, at 8:21 AM, Segher Boessenkool wrote: >>>> Why not put the PVR in core dumps that'd make it all easier.. >>> >>> PVR wouldn't be very useful... What if you have altivec disabled ? >>> Also >>> that would mean your gdb has to know about all new processors... >> >> Is that such a big deal? :D >> >> Hypothetically it would be impossible to determine if you were >> running >> on a G5 with the FPU and AltiVec turned off or an e500 core with SPE, >> given the data saved. > > And that is exactly as should be: a core dump represents the execution > state of a user program, it has nothing to do with the machine it was > generated on; it even is possible to restart a core dump generated on > e.g. an e500 on a 970, as long as it doesn't use facilities (e.g., > SPE) > that the latter processor / execution environment doesn't provide. > >> Is that a misfeature of GDB that we even have to >> worry about this, or some noble plus point of a unified ISA? You >> decide :) > > We don't have to worry about it :-)
We should worry about it. If one misinterprets the core file you will get unexpected behavior. I see no reason not to do this properly and mark the sections such that its clear if its AltiVec or SPE state, rather than overloading the x86 XFPU type. - k _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
